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发表于 2006-8-28 00:49:31
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来自 陕西西安
多谢,终于找到了 :)
我的是8.2版,相同的内容在
Chapter 6: Eigenvalue problems
6.2 Frequency analysis
... ....
! If the structure is nonlinear and is preloaded, you must perform
the analysis in two runs. In the first run, you apply the preload
(gravity loads, thermal loads, initial strains, etc.) in a nonlinear
static analysis. This run can contain one or more solution steps.
In the second run, you restart from the last solution of the first
run, then perform a frequency analysis. The frequency analysis is,
as stated above, performed based on the stiffness and mass matrix
corresponding to the time of solution start; in this case the time of
solution start is the time corresponding to the restart analysis.
Therefore the stiffness and mass matrices include all geometric and
material nonlinearities corresponding to the end of the nonlinear
static analysis.
... ...
一直以为ADINA的非线性模态分析有独到之处 :(
看来ADINA的非线性模态也是加了预应力的模态分析,跟ANSYS一样,ADINA可以卸载了:)
再次感谢 runinwind ! |
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